61543 has 2 divisors, whose sum is σ = 61544. Its totient is φ = 61542.

The previous prime is 61519. The next prime is 61547. The reversal of 61543 is 34516.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61543 - 2⁵ = 61511 is a prime.

It is a plaindrome in base 15.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 61543.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30771 + 30772.

It is an arithmetic number, because the mean of its divisors is an integer number (30772).

2⁶¹⁵⁴³ is an apocalyptic number.

61543 is a deficient number, since it is larger than the sum of its proper divisors (1).

61543 is an equidigital number, since it uses as much as digits as its factorization.

61543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 19.

The square root of 61543 is about 248.0786165714. The cubic root of 61543 is about 39.4814312124.

The spelling of 61543 in words is "sixty-one thousand, five hundred forty-three".